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How big is 1,400 circular mils?

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It's about as big as a Ballpoint Pen Tip.
(a.k.a. Biro, a.k.a. ball pen, a.k.a. dot pen) (for medium tip)
The most common size of ballpoint pen — a medium-tip — measures 1,400 circular mils. A typical ballpoint pen can write more than 8,500 m (28,000 ft) before running out of ink.
It's about one-one-hundredth as big as a Nailhead.
In other words, 1,400 circular mils is 0.009125 times the size of a Nailhead, and the size of a Nailhead is 109.6 times that amount.
(for 11-gauge wire nai)
An 11-gauge nailhead measures 153,400 circular mils. Nails have been used since ancient times; archaeologists have discovered Ancient Egyptian nails that are over 5,000 years old.
It's about one-three-hundred-fiftieth as big as a Dime.
In other words, 1,400 circular mils is 0.002816 times the size of a Dime, and the size of a Dime is 355.1 times that amount.
(United States ten-cent coin) (a.k.a. Roosevelt dime)
The dime, in its current design since 1946, has a diameter of 17.91 mm (0.705 in) and an area of 497,100 circular mils.
It's about one-four-hundredth as big as a Penny.
In other words, 1,400 circular mils is 0.00249 times the size of a Penny, and the size of a Penny is 402 times that amount.
(United States one-cent coin) (a.k.a. Lincoln penny, a.k.a. Cent, a.k.a. One cent piece)
The Lincoln penny, in its current design since 1909, has a diameter of 19.05 mm (0.75 in) and an area of 562,000 circular mils.
It's about one-five-hundredth as big as a Nickel.
In other words, 1,400 circular mils is 0.002008 times the size of a Nickel, and the size of a Nickel is 498 times that amount.
(United States five-cent coin) (a.k.a. Jefferson nickel)
The nickel, in its current design since 1938, has a diameter of 21.21 mm (0.835 in) and an area of 697,200 circular mils.
It's about one-five-hundredth as big as a Postage Stamp.
In other words, the size of a Postage Stamp is 500 times 1,400 circular mils.
(average; United States dimensions)
A typical postage stamp measures an average of 800,000 circular mils. One of the most prized stamps among collectors is the US-issued "Inverted Jenny" stamp printed in 1918, which features an upside-down image of Curtiss JN-4 ("Jenny") airplane; a single stamp sold for $977,500 at a 2007 auction.
It's about one-six-hundred-fiftieth as big as a Quarter.
In other words, 1,400 circular mils is 0.001535 times the size of a Quarter, and the size of a Quarter is 651.5 times that amount.
(United States quarter-dollar coin) (a.k.a. Quarter dollar, a.k.a. Washington quarter, a.k.a. two bits)
The George Washington quarter, in circulation in various forms since 1932, has a diameter of 24.26 mm (0.955 in) and an area of 912,200 circular mils.